June, 1908.] ROHWER : NEW WESTERN TENTHREDINID/E. Ill 



simple ; hind tibia; as long as or a little longer than the first two tarsal joints, not 

 as long as all the tarsal joints. Transverse radial nervure received beyond middle 

 of third cubital (in the type it is almost interstitial with the third transverse cubitus, 

 in the paratype it is nearer the middle of the cell) ; transverse median in about 

 middle of first discoidal ; radial cell of hind wing with a short appendiculation ; 

 lanceolate cell of hind wing briefly, but distinctly, petiolate at apex. Abdomen not 

 very shining, apical segment with short hairs (these hairs are more distinct on the 

 paratype). Color black ; labrum, posterior angles of pronotum and tegulse white ; 

 palpi flavous ; apical tip of anterior coxa; beneath pallid, rest of coxa; black ; femora, 

 tibia;, tarsi except posterior pair which are brownish, abdominal segments two, three, 

 four and five (in the paratype the fifth segment is mostly brownish), except a band on 

 sides, partly on venter, which is black, reddish yellow. Wings fusco-hyaline ; ner- 

 vures and stigma except at base which is white and the basal part of costa, which is 

 reddish black. 



Female. — Length 7 mm. Very similar to $ but the coxa; beneath are reddish 

 yellow ; trochanters black as in $ ; the transverse radial received in middle of 

 third cubital ; transvere median a little basal to middle of first discoidal. Sheath 

 broad, rather truncate at apex, upper margin sharply pointed, lower apical maigin 

 rounded. 



Habitat. — d\ Horsetooth Gulch, Larimer Co., Colo., June 5, 1893 

 (C. P. Gillette) ; d\ Ft. Collins, Colo., June 4, 1894 (C. P. Gillette); 

 9, Ft. Collins, Colo., June 16, 1899. The specimen from Horse- 

 tooth Gulch, which is the type, is in the collection of the Colorado 

 Agricultural College. 



This species is related to Parasiobla rufocinctus Nort., but maybe 

 easily known from that species by the densely but finely punctured 

 head and thorax ; the better developed ocellar basin ; the radial cell 

 of hind wings having an appendiculation ; lanceolate cell of hind 

 wings petiolate at the apex ; rufous band on the abdomen interrupted 

 beneath ; posterior angles of pronotum white ; less robust stature ; 

 and many other characters. 



In Dr. Ashmead's table (Can. Ent., Dec, 1898) this species runs 

 to his genus Aomodyctium, but the claws are simple. The placing of 

 this species in Taxonus is only provisional, although it belongs with 

 Taxonus according to Rev. Konow (Genera Insectorum). 

 13. Rhogogaster sayi, new species. 



Female. — Length 7.5 mm. Head about as wide as thorax, not wider behind 

 the eyes; mesial to each lateral ocellus there is a carina which runs down nearly to the 

 antenna; where the two join leaving the lower ocellus in an elongate oval basin, open 

 between the lateral ocelli. There is a distinct furrow outside of lateral ocelli to vertex ; 

 frontal area well defined between the antenna; ; eyes nearly touching base of mandi- 

 bles ; clypeus deeply, squarely emarginate, lobes somewhat triangular, rounded at apex : 

 labrum nearly as wide as clypeus, rounded at apex ; apex with a few long hairs ; an- 



